Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f15b69bebaf851…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 12:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca8f73fb906598fe3eb73765b25041f3 SHA-1: 48604b0dae34321617d64570449c59c448e9778e SHA-256: 26f15b69bebaf851dd6b4684eb4f4b2ae3ea62d0930e2eaeb85971309edcbf5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434bbeb953f---kigapufu.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5d35c7f264492ce56d17f56b18cd9cb8/vuvodipatezujujaxo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161443d356f10f---reropavigup.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/59282705185.pdfIn PDF document text
    • https://kawanmto.com/contents/files/dagokuruxez.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/61180610272.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wigig.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/91683377538.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/jejalekinewoxuwata.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a6e2556c7add6a622333b4b370804567/97074812311.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/22938410240.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/58615387399.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__614AE34F62FE2.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/72965852190.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/68186287037.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/72310703623.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nogotefijogofovekujap.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/wusoxedevefabilan.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/gutor.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/tuxilofiroregoriwimez.pdfIn PDF document text
    • http://live-net.it/file/judid.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161352aba1c984---zasegakosudas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+check+your+clipboard+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD51 10968 bytes
SHA-256: bcb8c49a02b1fa74bd1cf4ffba6ee0635e5de9c3dcb6952f868311e83b774758
font_01_sfnt_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 16252 bytes
SHA-256: e4fed9e841b6776dea98ddf422e2d40a2aea3cf2fe155281ddeba92969866f89